Improvement in calendars



. 2 sheets-Sheet 1.

J. M. WOLBREOHT.

Calendars.

No. 219,054. Patented Aug. 26,1879.

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Calendars.

No. 219,054. Patented Aug. 26,1879.

NJETERS, PHUTD-LITHOGRAFHER. WASHINGTON. D c.

U ITED STATES PATENT OFFICE.

JOHN M. WOLBREGHI, OF ST. LOUIS, MISSOURI.

IMPROVEMENT IN CALENDARS.

Specification forming part of Letters Patent No. 219,054, dated August26, 1879; application filed July 23. 1879.

To all whom it may concern:

Be it known that I, J ornv M. WOLBREGHT, of St. Louis, in the county ofSt. Louis and State of Missouri, have invented certain new and usefulImprovements in Calendars; and I do herebydeclare the following to be afull, clear, and exact description of the invention, such as will'enableothers skilled in the art to which it appertains to make and use thesame, reference being bad to the accompanyingdrawings, and to letters ofreference marked there on, which form a part of this specification.

My invention relates to an approximately perpetual calendar, whereby Iam enabled to give the day of the week corresponding to any given datefor centuries, past or future. In other words, the date ascertained, theday of the week is readily found; and to this end the inventionconsists, essentially, in a tabular representation of the years of thecentury upon a movable plate, partly exposed through an orifice in acover, on which are arranged the days of the week and the centuries ofthe Christian erain such a manner that, by a simple mechanicaloperation, the day of the week on which any particular annual eventoccurs can be determined,

It also consists ina tabular representation of the days of the month ona plate adjustable to an independent plate with a table of the months ofthe year thereon, both movable and partially exposed through orifices ina cover, on which are arranged the days of the Week in such a mannerthat when the day of the week of one day of the year is known thecalendar for any month of that year can be determined by a simplemechanical operation.

In the following device the centuries and months have been arranged tocorrespond to the 1st of January. For certain purposes it may beconsidered preferable to use the 1st of March, with correspondingchanges in the arrangement of months and centuries, as by such anarrangement no notice need be taken of leap-years.

In carrying out'my invention I employ an approximately segmental case,consisting of the body, provided with a segmental recess to receiveanoseillatingsegmental plate, as shown. This recess terminates upon theupper or axis end in a circular portion corresponding with a when thesaid pin is forced down.

The body is provided with a cover of exactly corresponding size andform, which closes the recess, leaving the pivoted plate and independentplate to be operated, one or both, by the thumb pin. tions or workingknobs, one upon each side, which project a through segmental openingsupon the back and front plate-that is, the body or cover--as shown.

For convenience of description, I shall consider the complete device asegment of a circle with the pivotal point of the pivoted plate as anaxis.

It will be observed that the front surface of the pivoted plate carriesa perfect lunar calendar, which will serve for any year, the month beingknown This calendar may be arranged for any month and serve efficiently,the figures being arranged upon the pivoted plate within radial lines,so that one months calendar shall appear wherever arranged, thedesignations for the seven days of the week being above a segmentalopening in the caps or cover, and another opening discloses the monthson the independent plate.

The back surface of the body presents an orifice with radial sideshaving within radial lines below said orifice designations for conturies, and above designations for the seven days of the week. Upon thepivoted segment described are radial lines, between which are arrangedfigures running from one to one hundred, arranged arbitrarily, so as topresent a group of four, and a space occurring after each leap-year.

It will be thus observed that the device presents a perpetual calendar,a monthly calendar being upon one side, serving fora whole year,

while the opposite side, in connection there with, serves for-centuries.

This thumb-pin has two projec- From the description of the operationhereinafter the advantages of my improved device will be obvious.

slot, 0, in which operates a thumb-pin, D,-

having opposite lateral knobs d, as shown. This pin operates in slots 6in a segmental plate, E, which works loosely in the space B and the apexc operates in the circular space 13, as clearly shown in Fig. 3.

The back face of the body is provided with a segmental orifice, A, (seeFig. 2,) above which are designations of the seven days of the week, asshown at a, and below which, at a, an arbitrary arrangement ofcenturies. The back face of the plate U, Fig. 3, is provided with radiallines 61 and an arbitrary arrangement of figures, D, and at any place inwhich the plate 0 may be positioned a system of figures, from one to onehundred, is visible through the orifice A, in groups of four, the vacantspace following the leap-year.

F, Fig. 1, represents the face-plate or cover secured to the body A, andit is provided with an orifice, f, at the top of which are designationsfor the days of theweek f,- and the face of the plate 0, Fig. 4, has asystem of figures, G, within radial lines g, in such an arrange= mentthat, whatever the position of said plate, a monthly calendar will beapparent through the orifice f, as shown.

H represents an orifice in the cover F, through which may be discernedthe months printed upon the curved plate E, Fig. 5. The curved plate Eis made adjustable to the pivoted plate (3, and has the designations forthe months so arranged that when the two plates are properly adjustedrelative to one another for any particular month theywill then becorrectly adjusted for any other month of the same year.

Tofind by my improved device the day of v the week corresponding to anyparticular date:

First, on back face, bring thumb-pin over the column containing thecentury of the date, find the remaining numbers of the date among thefigures D, and the letter at the head of the column in which they appearwill designate the day of the week on which that year enters. Second, onfront face, move the thumb-pin until the designations JAN appear inopening H, holding it there; raise the thumb-pin, and bring the figure 1under the day of the week obtained from other side, and then lower thethumb-pin. The calendar will now be adj usted for that year. Any monthmade to appear in opening H will have its corresponding calendarappearing in opening f, every day of the month appearing directly underits respective day of the week. The position of the name of the monthappearing in opening H serves as an index to the number of days themonth contains.

For the latter ten months of leap-years the adjustment must be made bybringing figure 1 under the day of the week following the one obtainedfrom the other side.

Further explanation of the operation of my device is deemed unnecessary,it being obvious from the foregoing description.

I claim. as my invention- 1. The combination of the plate 0, havingcentury-dates D and monthly dates G on its opposite sides, with theadjustable strip E, having the months thereon, substantially asspecified.

2. The month-strip E, in combination with the plate 0, provided with thedates G, and the plate F, with the orifice H, substantially as and forthe purpose specific 3. The combination of the plate A, provided withthe centuries a and designations of the days of the week a, with theplate 0, provided with the century-calendar D, substantially and for thepurpose specified.

4. The plate 0 0, body A A, and cover F f, combined with the strip E anda connecting lock-pin, D, as herein specified.

5. The body A A, having recessjB B B and cover F f, combined with plate0, pin D d, and stripE, substantially as and for the purpose hereinshown and described.

In testimony that I claim the foregoing I have hereunto set my hand this16th day of May, 1879.

H. CLAY SMITH, H. J. ENNIS.

